sei-protocol · alexander-sei · Jun 27, 2026 · Jun 20, 2026 · Jun 25, 2026 · Jun 27, 2026
diff --git a/evm/debugging-contracts.mdx b/evm/debugging-contracts.mdx
@@ -3,15 +3,18 @@
 description: 'Advanced debugging techniques for EVM transactions on Sei. Learn transaction template generation and analysis using seid and Foundry cast tools.'
 keywords: ['EVM debugging', 'transaction templates', 'foundry cast', 'evm analysis', 'transaction debugging']
 ---
+
+import { RunSnippet } from '/snippets/run-snippet.jsx';
+
 ## Overview
 
 Debugging EVM transactions on Sei requires understanding both the transaction creation process and how to analyze transaction behavior. This guide covers advanced debugging techniques using transaction template generation, analysis tools, and comprehensive transaction inspection methods to help developers identify and resolve issues in their EVM interactions.

 ## Transaction Template Generation

 The `--generate-only` flag transforms any Sei CLI transaction command into a template generator, creating complete transaction structures without broadcasting them. Through the `--generate-only` flag and Foundry's `cast` tool, developers can craft, analyze, and debug transactions across the EVM environment.

 ### Basic Command Pattern

 The general pattern follows this structure:

@@ -19,7 +22,7 @@
 seid tx <module> <action> <parameters> --from <key> --evm-rpc http://url-to-sei-evm-rpc --generate-only
 ```

 ### Generating EVM Transaction Templates

 To generate an EVM transaction template, use the `evm` module with `--generate-only`. Here's an example sending SEI to another EVM address:

@@ -36,7 +39,7 @@

 ---

 ## Analyzing EVM Transactions with Cast

 Once you have a transaction hash, you can use Foundry's `cast` command to inspect the transaction details:

@@ -66,7 +69,7 @@
 value                   0
 ```

 ### Additional Analysis Commands

 **Get transaction receipt:**

@@ -85,13 +88,13 @@

 ---

 ## RPC Consistency

 <Warning>Always point `cast` commands to an EVM RPC endpoint (for example, `$EVM_RPC_URL`), not a Cosmos RPC URL.</Warning>

 ---

 ## Tracing and Revert Reasons

 If your endpoint supports debug RPC methods, you can retrieve full execution traces and revert reasons:

@@ -112,7 +115,7 @@

 ---

 ## Reproduce with a Local Fork

 Fork the network locally to reproduce issues deterministically and run traces even if remote debug RPC is disabled:

@@ -130,7 +133,7 @@

 ---

 ## Event Logs and Decoding

 Use the receipt to inspect logs and decode with the contract ABI:

@@ -146,7 +149,7 @@

 ---

 ## Nonce, Balance, and Gas Diagnostics

 Check common failure points quickly:

@@ -165,9 +168,33 @@
 - Underpriced `maxFeePerGas`/`maxPriorityFeePerGas`
 - Chain ID mismatch
 
+## Try it live
+
+Each `cast` diagnostic above is a plain read-only JSON-RPC call. Run the same four against Sei mainnet right here — the example address (`0xAa55…3d96`) is the sender from the `cast tx` output earlier on this page.
+
+<RunSnippet method="eth_chainId" network="mainnet" title="cast chain-id" description="eth_chainId — decodes to 1329. A mismatch here is the most common cause of a rejected transaction." />
+
+<RunSnippet method="eth_gasPrice" network="mainnet" title="cast gas-price" description="eth_gasPrice — the current gas price in wei. Compare it against your maxFeePerGas when a transaction is stuck as underpriced." />
+
+<RunSnippet
+  method="eth_getTransactionCount"
+  params={['0xAa55a16dD4E73c48C968928983c2bcC98d913d96', 'latest']}
+  network="mainnet"
+  title="cast nonce 0xAa55…3d96"
+  description="eth_getTransactionCount at the latest block — the account's next nonce. Swap in your own address."
+/>
+
+<RunSnippet
+  method="eth_getBalance"
+  params={['0xAa55a16dD4E73c48C968928983c2bcC98d913d96', 'latest']}
+  network="mainnet"
+  title="cast balance 0xAa55…3d96"
+  description="eth_getBalance in wei — confirm the account can cover gas before you dig into a failed send."
+/>
+
 ---
 
 ## Offline Workflow with --generate-only

 Generate, inspect, sign, and broadcast safely:

@@ -187,7 +214,7 @@

 ---

 ## Precompile Awareness

 Calls to system precompiles (for example, addresses like `0x...100b`) may have specific input/output formats and error behavior.

@@ -206,7 +233,7 @@

 ---

 ## Transaction Analysis

 When analyzing transactions, follow these essential practices:

@@ -236,7 +263,7 @@

 ---

 ## Error Handling

 Handle potential EVM transaction issues with proper monitoring:

@@ -262,7 +289,7 @@

 ---

 ## Security Guidelines

 <Warning>
  <strong>Critical Security Requirements:</strong> Keep private keys secure and never include them in templates. Use an `.env` file or other environment variables when working with wallet keys or mnemonics. Never commit sensitive information to version control. Always verify transaction details before signing.

diff --git a/evm/evm-foundry.mdx b/evm/evm-foundry.mdx
@@ -4,6 +4,11 @@
 description: 'Learn how to develop, test, and deploy smart contracts on Sei EVM using Foundry, with step-by-step examples of contract creation, testing, deployment, and interaction using both CLI and ethers.js.'
 keywords: ['sei evm', 'foundry', 'forge', 'smart contract', 'web3 development', 'nft', 'erc721', 'erc20']
 ---
+
+import { RunSnippet } from '/snippets/run-snippet.jsx';
+import { SandboxEmbed } from '/snippets/sandbox-embed.jsx';
+import { AddSeiButton } from '/snippets/add-sei-button.jsx';
+
 This tutorial will guide you through setting up Foundry for Sei EVM development and using OpenZeppelin contracts to build secure, standardized smart contracts. We'll cover environment setup, contract creation, deployment, and show how to leverage OpenZeppelin's pre-built components with the powerful Foundry toolkit.
 
 <Info>Watch the video walkthrough for this topic in the [Video Tutorials](/evm/videos) section.</Info>
@@ -16,8 +21,30 @@
 
 </Tip>
 
+## Try it before you install
+
+Installing Foundry and scaffolding a project takes a few minutes. If you just want to see a contract deploy to Sei, you can do both of these right now in the browser.
+
+First, confirm the RPC endpoints you'll put in `foundry.toml` respond:
+
+<RunSnippet method="eth_chainId" network="testnet" title="eth_chainId · atlantic-2" description="Testnet RPC — decodes to 1328." />
+
+<RunSnippet method="eth_chainId" network="mainnet" title="eth_chainId · pacific-1" description="Mainnet RPC — decodes to 1329." />
+
+Then add Sei testnet to your wallet and deploy a minimal `Counter.sol` from Remix — no `forge`, no install. In Remix: compile under **Solidity Compiler**, then **Deploy & Run** with **Environment** set to **Injected Provider — MetaMask**.
+
+<AddSeiButton network="testnet" label="Add Sei testnet" />
+
+<SandboxEmbed
+  kind="remix"
+  src="https://remix.ethereum.org/?#activate=solidity,fileManager&code=Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4yNDsKCi8vLyBAdGl0bGUgQ291bnRlciDigJQgbWluaW1hbCBjb250cmFjdCB0byBjb21waWxlICYgZGVwbG95IHRvIFNlaSB0ZXN0bmV0Lgpjb250cmFjdCBDb3VudGVyIHsKICAgIHVpbnQyNTYgcHVibGljIGNvdW50OwogICAgZnVuY3Rpb24gaW5jcmVtZW50KCkgZXh0ZXJuYWwgeyBjb3VudCsrOyB9CiAgICBmdW5jdGlvbiBkZWNyZW1lbnQoKSBleHRlcm5hbCB7IGNvdW50LS07IH0KfQ"
+  title="Counter.sol · deploy to Sei testnet"
+  description="Remix IDE with a minimal Counter contract preloaded. Compile in-browser, then deploy to Sei testnet."
+/>
+
 ## Table of Contents
 
+- [Try it before you install](#try-it-before-you-install)
 - [Prerequisites](#prerequisites)
 - [Setting Up Your Development Environment](#setting-up-your-development-environment)
 - [Configuring Foundry for Sei EVM](#configuring-foundry-for-sei-evm)
@@ -36,7 +63,7 @@
 - A wallet with SEI tokens for gas
 - [Node.js](https://nodejs.org/) (v18.0.0 or later) for ethers.js interactions

 ## Setting Up Your Development Environment

 First, let's install Foundry if you haven't already. Follow the [installation guide](https://book.getfoundry.sh/getting-started/installation) or use the quick install command:

@@ -90,7 +117,7 @@

 <Warning>Add `.env` to your `.gitignore` file to prevent committing sensitive information such as your `PRIVATE_KEY` and potentially lose funds.</Warning>

 ## Using OpenZeppelin Contracts

 OpenZeppelin provides a library of secure, tested smart contract components. Let's install OpenZeppelin contracts:

@@ -104,7 +131,7 @@
 forge remappings > remappings.txt
 ```

 ## Creating and Deploying Smart Contracts

 Let's create different types of smart contracts. Choose from the tabs below based on what you want to build:

@@ -349,7 +376,7 @@
  </Tab>
 </Tabs>

 ## Testing Your Smart Contracts

 Foundry provides excellent testing capabilities. Let's create comprehensive tests for our contracts.

@@ -552,11 +579,11 @@
 forge test -vvv
 ```

 ## Deploying to Sei Testnet and Mainnet

 Now let's deploy our contracts to the Sei networks. You can use either Forge scripts or direct deployment commands.

 ### Using Forge Scripts (Recommended)

 Deploy to Sei testnet:

@@ -570,7 +597,7 @@
 forge script script/DeployCounter.s.sol --rpc-url $SEI_MAINNET_RPC --private-key $PRIVATE_KEY --broadcast
 ```

 ### Using Direct Forge Create Commands

 Alternatively, you can deploy directly:

@@ -595,11 +622,11 @@
 Transaction hash: 0xYOUR_TX_HASH
 ```

 ## Interacting with Deployed Contracts

 Once deployed, you can interact with your contracts using Foundry's `cast` tool or ethers.js.

 ### Using Cast Commands

 ```bash
 # Query the counter value

diff --git a/evm/evm-general.mdx b/evm/evm-general.mdx
@@ -4,6 +4,11 @@
 description: "Comprehensive guide on Ethereum Virtual Machine (EVM) on Sei blockchain. Learn about smart contract languages, development tools, and best practices for building on Sei's parallelized EVM."
 keywords: ['sei evm', 'ethereum virtual machine', 'smart contracts', 'solidity', 'vyper']
 ---
+
+import { RunSnippet } from '/snippets/run-snippet.jsx';
+import { SandboxEmbed } from '/snippets/sandbox-embed.jsx';
+import { AddSeiButton } from '/snippets/add-sei-button.jsx';
+
 ## Overview
 
 The Ethereum Virtual Machine (EVM) is the runtime environment for smart
@@ -26,6 +31,25 @@
    machine-readable instructions) and deployed to the EVM compatible network.
    The EVM executes this bytecode.
 
+## Try it: deploy without any setup
+
+You don't need a local toolchain to ship a contract to Sei. First confirm the network is live, then compile and deploy a minimal `Counter.sol` to testnet straight from the browser.
+
+<RunSnippet method="eth_chainId" network="testnet" title="eth_chainId · atlantic-2" description="Confirms the testnet RPC responds — decodes to 1328, the chain ID your tooling needs." />
+
+<RunSnippet method="eth_chainId" network="mainnet" title="eth_chainId · pacific-1" description="Confirms the mainnet RPC responds — decodes to 1329." />
+
+Add Sei testnet to your wallet, then deploy from Remix below — compile under **Solidity Compiler**, then **Deploy & Run** with **Environment** set to **Injected Provider — MetaMask**:
+
+<AddSeiButton network="testnet" label="Add Sei testnet" />
+
+<SandboxEmbed
+  kind="remix"
+  src="https://remix.ethereum.org/?#activate=solidity,fileManager&code=Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4yNDsKCi8vLyBAdGl0bGUgQ291bnRlciDigJQgbWluaW1hbCBjb250cmFjdCB0byBjb21waWxlICYgZGVwbG95IHRvIFNlaSB0ZXN0bmV0Lgpjb250cmFjdCBDb3VudGVyIHsKICAgIHVpbnQyNTYgcHVibGljIGNvdW50OwogICAgZnVuY3Rpb24gaW5jcmVtZW50KCkgZXh0ZXJuYWwgeyBjb3VudCsrOyB9CiAgICBmdW5jdGlvbiBkZWNyZW1lbnQoKSBleHRlcm5hbCB7IGNvdW50LS07IH0KfQ"
+  title="Counter.sol · deploy to Sei testnet"
+  description="Remix IDE with a minimal Counter contract preloaded. Compile in-browser, then deploy to Sei testnet."
+/>
+
 ## Smart contract languages
 
 The two most popular languages for developing smart contracts on the EVM are
@@ -43,7 +67,7 @@
    programming languages).
  - Complex user-defined types.

 #### Example solidity contract

 ```solidity
 // SPDX-License-Identifier: GPL-3.0
@@ -101,7 +125,7 @@
  - Infinite-length loops
  - Binary fixed points

 #### Example Vyper contract

 ```python
 # Open Auction

diff --git a/evm/evm-hardhat.mdx b/evm/evm-hardhat.mdx
@@ -4,6 +4,11 @@
 description: 'Learn how to set up Hardhat for Sei EVM development, create and deploy smart contracts, and leverage OpenZeppelin components for secure, standardized implementations.'
 keywords: ['hardhat', 'smart contracts', 'sei development', 'evm deployment', 'openzeppelin']
 ---
+
+import { RunSnippet } from '/snippets/run-snippet.jsx';
+import { SandboxEmbed } from '/snippets/sandbox-embed.jsx';
+import { AddSeiButton } from '/snippets/add-sei-button.jsx';
+
 This tutorial will guide you through setting up Hardhat for Sei EVM development and using OpenZeppelin contracts to build secure, standardized smart contracts. We'll cover environment setup, contract creation, deployment, and show how to leverage OpenZeppelin's pre-built components.
 
 <Info>Watch the video walkthrough for this topic in the [Video Tutorials](/evm/videos) section.</Info>
@@ -16,8 +21,30 @@
 
 </Tip>
 
+## Try it before you install
+
+Setting up the full toolchain takes a few minutes. If you just want to see a contract deploy to Sei, you can do both of these right now in the browser.
+
+First, confirm the RPC endpoints you'll put in `hardhat.config` respond:
+
+<RunSnippet method="eth_chainId" network="testnet" title="eth_chainId · atlantic-2" description="Testnet RPC — decodes to 1328." />
+
+<RunSnippet method="eth_chainId" network="mainnet" title="eth_chainId · pacific-1" description="Mainnet RPC — decodes to 1329." />
+
+Then add Sei testnet to your wallet and deploy a minimal `Counter.sol` from Remix — no Node, no install. In Remix: compile under **Solidity Compiler**, then **Deploy & Run** with **Environment** set to **Injected Provider — MetaMask**.
+
+<AddSeiButton network="testnet" label="Add Sei testnet" />
+
+<SandboxEmbed
+  kind="remix"
+  src="https://remix.ethereum.org/?#activate=solidity,fileManager&code=Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4yNDsKCi8vLyBAdGl0bGUgQ291bnRlciDigJQgbWluaW1hbCBjb250cmFjdCB0byBjb21waWxlICYgZGVwbG95IHRvIFNlaSB0ZXN0bmV0Lgpjb250cmFjdCBDb3VudGVyIHsKICAgIHVpbnQyNTYgcHVibGljIGNvdW50OwogICAgZnVuY3Rpb24gaW5jcmVtZW50KCkgZXh0ZXJuYWwgeyBjb3VudCsrOyB9CiAgICBmdW5jdGlvbiBkZWNyZW1lbnQoKSBleHRlcm5hbCB7IGNvdW50LS07IH0KfQ"
+  title="Counter.sol · deploy to Sei testnet"
+  description="Remix IDE with a minimal Counter contract preloaded. Compile in-browser, then deploy to Sei testnet."
+/>
+
 ## Table of Contents
 
+- [Try it before you install](#try-it-before-you-install)
 - [Prerequisites](#prerequisites)
 - [Setting Up Your Development Environment](#setting-up-your-development-environment)
 - [Configuring Hardhat for Sei EVM](#configuring-hardhat-for-sei-evm)
@@ -34,7 +61,7 @@
 - [npm](https://www.npmjs.com/) (v7.0.0 or later) or [yarn](https://yarnpkg.com/)
 - A code editor (VS Code recommended)

 ## Setting Up Your Development Environment

 Let's create a new project and set up Hardhat:

@@ -123,11 +150,11 @@

 <Warning>Use a dedicated, throwaway deploy key funded with only what you need — never a personal wallet holding real funds.</Warning>

 ## Using OpenZeppelin Contracts

 OpenZeppelin provides a library of secure, tested smart contract components that you can use to build your applications. The `@openzeppelin/contracts` package was already installed during setup, so you're ready to import its contracts directly.

 ## Creating and Deploying an ERC20 Token, ERC721 NFT or an Upgradeable UUPS Token

 <Tabs>
  <Tab title="ERC20">
@@ -492,7 +519,7 @@
 </Tab>
 </Tabs>

 ## Testing Your Smart Contracts

 Hardhat makes it easy to test your contracts before deploying them. Create a test file `test/sei-token-test.ts`:

@@ -576,7 +603,7 @@
 npx hardhat test
 ```

 ## Deploying to Sei Testnet and Mainnet

 Once you've tested your contracts, you can deploy them to the Sei testnet or mainnet. To deploy, you'll need:


diff --git a/evm/evm-parity/examples/deploy-verify.mdx b/evm/evm-parity/examples/deploy-verify.mdx
@@ -3,10 +3,30 @@
 description: 'Deploying and verifying smart contracts on Sei with viem, ethers, Foundry, and Hardhat'
 ---
 
+import { SandboxEmbed } from '/snippets/sandbox-embed.jsx';
+import { AddSeiButton } from '/snippets/add-sei-button.jsx';
+
 Sei is EVM-compatible — standard deployment tooling works without modification. This page covers deploying a contract and verifying its source on the Sei block explorer.
 
 For a deeper look at verification options (Remix, Sourcify UI, batch verification), see the [Verify Contracts](/evm/evm-verify-contracts) page.
 
+## Try it: deploy from your browser
+
+No local toolchain required — compile and deploy a contract to Sei testnet straight from the browser. The Remix sandbox below preloads a minimal `Counter.sol`.
+
+First, add Sei testnet to your wallet:
+
+<AddSeiButton network="testnet" label="Add Sei testnet" />
+
+Then in Remix: compile under the **Solidity Compiler** tab, open **Deploy & Run**, set **Environment** to **Injected Provider — MetaMask**, and click **Deploy**. Sei has instant finality, so the deployment confirms in well under a second.
+
+<SandboxEmbed
+  kind="remix"
+  src="https://remix.ethereum.org/?#activate=solidity,fileManager&code=Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4yNDsKCi8vLyBAdGl0bGUgQ291bnRlciDigJQgbWluaW1hbCBjb250cmFjdCB0byBjb21waWxlICYgZGVwbG95IHRvIFNlaSB0ZXN0bmV0Lgpjb250cmFjdCBDb3VudGVyIHsKICAgIHVpbnQyNTYgcHVibGljIGNvdW50OwogICAgZnVuY3Rpb24gaW5jcmVtZW50KCkgZXh0ZXJuYWwgeyBjb3VudCsrOyB9CiAgICBmdW5jdGlvbiBkZWNyZW1lbnQoKSBleHRlcm5hbCB7IGNvdW50LS07IH0KfQ"
+  title="Counter.sol · deploy to Sei testnet"
+  description="Remix IDE with a minimal Counter contract preloaded. Compile in-browser, then deploy to Sei testnet."
+/>
+
 ## Deploying with viem or ethers
 
 <CodeGroup>
@@ -115,7 +135,7 @@
 npx hardhat ignition deploy ignition/modules/MyContract.ts --network sei
 ```

 ## Verifying Contracts

 Sei's block explorer is [Seiscan](https://seiscan.io). The recommended verification method is [Sourcify](https://sourcify.dev/) — no API key required.

@@ -192,7 +212,7 @@

 Running `npx hardhat verify` without the `sourcify` subtask attempts verification on all enabled providers (Etherscan, Blockscout, and Sourcify) in a single run.

 ## Network Reference

 | Network | Chain ID | RPC | Explorer |
 | --- | --- | --- | --- |

diff --git a/evm/evm-parity/examples/erc1155.mdx b/evm/evm-parity/examples/erc1155.mdx
@@ -3,10 +3,30 @@
 description: 'Reading and writing ERC-1155 multi-token contracts on Sei with viem and ethers'
 ---
 
+import { SandboxEmbed } from '/snippets/sandbox-embed.jsx';
+import { AddSeiButton } from '/snippets/add-sei-button.jsx';
+
 # ERC-1155 Interaction
 
 ERC-1155 is the multi-token standard — a single contract can hold both fungible tokens (like gold coins in a game) and non-fungible tokens (like unique items), with efficient batch operations built in. Standard ERC-1155 contracts work on Sei without modification.
 
+## Try it: deploy an ERC-1155
+
+Compile and deploy a real ERC-1155 to Sei testnet from the browser — the Remix sandbox preloads an OpenZeppelin-based `DemoMultiToken` with a public `mint(id, amount)`. Then point the read/write patterns below at your deployed address.
+
+First, add Sei testnet to your wallet:
+
+<AddSeiButton network="testnet" label="Add Sei testnet" />
+
+In Remix, compile under **Solidity Compiler**, then **Deploy & Run** with **Environment** set to **Injected Provider — MetaMask**.
+
+<SandboxEmbed
+  kind="remix"
+  src="https://remix.ethereum.org/?#activate=solidity,fileManager&code=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"
+  title="DemoMultiToken (ERC-1155) · deploy to Sei testnet"
+  description="Remix IDE with an OpenZeppelin ERC-1155 preloaded. Compile in-browser and deploy to Sei testnet."
+/>
+
 ## Setup
 
 <CodeGroup>
@@ -60,7 +80,7 @@

 </CodeGroup>

 ## Reading a Single Balance

 <CodeGroup>

@@ -79,7 +99,7 @@

 </CodeGroup>

 ## Batch Balance Query

 `balanceOfBatch` retrieves multiple owner/ID pairs in one call — the most efficient way to load a user's inventory:

@@ -107,7 +127,7 @@

 </CodeGroup>

 ## Reading Token Metadata URI

 ```ts viem
 const uri = await client.readContract({
@@ -120,7 +140,7 @@
 const resolvedUri = uri.replace('{id}', (1n).toString(16).padStart(64, '0'));
 ```

 ## Transferring a Single Token

 <CodeGroup>

@@ -142,7 +162,7 @@

 </CodeGroup>

 ## Batch Transfer

 Send multiple token IDs in a single transaction:

@@ -175,7 +195,7 @@

 </CodeGroup>

 ## Operator Approval

 <CodeGroup>

@@ -205,7 +225,7 @@

 </CodeGroup>

 ## Watching Transfer Events

 <CodeGroup>


diff --git a/evm/evm-parity/examples/erc20.mdx b/evm/evm-parity/examples/erc20.mdx
@@ -3,10 +3,30 @@
 description: 'Reading and writing ERC-20 tokens on Sei with viem and ethers'
 ---
 
+import { SandboxEmbed } from '/snippets/sandbox-embed.jsx';
+import { AddSeiButton } from '/snippets/add-sei-button.jsx';
+
 # ERC-20 Interaction
 
 Standard ERC-20 contracts work on Sei without modification. This page covers the common read and write operations using viem and ethers.
 
+## Try it: deploy an ERC-20
+
+Compile and deploy a real ERC-20 to Sei testnet from the browser — the Remix sandbox preloads an OpenZeppelin-based `DemoToken`. Then point the read/write patterns below at your deployed address.
+
+First, add Sei testnet to your wallet:
+
+<AddSeiButton network="testnet" label="Add Sei testnet" />
+
+In Remix, compile under **Solidity Compiler**, then **Deploy & Run** with **Environment** set to **Injected Provider — MetaMask**.
+
+<SandboxEmbed
+  kind="remix"
+  src="https://remix.ethereum.org/?#activate=solidity,fileManager&code=Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4yNDsKCmltcG9ydCAiQG9wZW56ZXBwZWxpbi9jb250cmFjdHMvdG9rZW4vRVJDMjAvRVJDMjAuc29sIjsKCmNvbnRyYWN0IERlbW9Ub2tlbiBpcyBFUkMyMCB7CiAgICBjb25zdHJ1Y3RvcigpIEVSQzIwKCJEZW1vIFRva2VuIiwgIkRFTU8iKSB7CiAgICAgICAgX21pbnQobXNnLnNlbmRlciwgMV8wMDBfMDAwICogMTAgKiogZGVjaW1hbHMoKSk7CiAgICB9Cn0"
+  title="DemoToken (ERC-20) · deploy to Sei testnet"
+  description="Remix IDE with an OpenZeppelin ERC-20 preloaded. Compile in-browser and deploy to Sei testnet."
+/>
+
 ## Setup
 
 <CodeGroup>
@@ -64,7 +84,7 @@

 </CodeGroup>

 ## Reading Token Metadata

 <CodeGroup>

@@ -88,7 +108,7 @@

 </CodeGroup>

 ## Reading Balances and Allowances

 <CodeGroup>

@@ -115,7 +135,7 @@

 </CodeGroup>

 ## Transferring Tokens

 <CodeGroup>

@@ -139,7 +159,7 @@

 </CodeGroup>

 ## Approving a Spender

 <CodeGroup>

@@ -173,7 +193,7 @@

 </CodeGroup>

 ## Watching Transfer Events

 <CodeGroup>

@@ -204,7 +224,7 @@

 </CodeGroup>

 ## Fetching Historical Transfers

 <CodeGroup>

@@ -225,6 +245,6 @@

 </CodeGroup>

 ## CosmWasm Token Compatibility

 CW20 tokens on Sei have ERC-20 pointer contracts that expose the standard ERC-20 interface. You can use all of the patterns above against a CW20 pointer address. See [Pointer Contracts](/evm/evm-parity/examples/pointer-contracts) for how to look up the pointer address.
diff --git a/evm/evm-parity/examples/erc721.mdx b/evm/evm-parity/examples/erc721.mdx
@@ -3,10 +3,30 @@
 description: 'Reading and writing ERC-721 NFTs on Sei with viem and ethers'
 ---
 
+import { SandboxEmbed } from '/snippets/sandbox-embed.jsx';
+import { AddSeiButton } from '/snippets/add-sei-button.jsx';
+
 # ERC-721 Interaction
 
 Standard ERC-721 contracts work on Sei without modification. This page covers reading token ownership, transferring NFTs, and managing approvals.
 
+## Try it: deploy an ERC-721
+
+Compile and deploy a real ERC-721 to Sei testnet from the browser — the Remix sandbox preloads an OpenZeppelin-based `DemoNFT` with a public `mint()`. Then point the patterns below at your deployed address.
+
+First, add Sei testnet to your wallet:
+
+<AddSeiButton network="testnet" label="Add Sei testnet" />
+
+In Remix, compile under **Solidity Compiler**, then **Deploy & Run** with **Environment** set to **Injected Provider — MetaMask**.
+
+<SandboxEmbed
+  kind="remix"
+  src="https://remix.ethereum.org/?#activate=solidity,fileManager&code=Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4yNDsKCmltcG9ydCAiQG9wZW56ZXBwZWxpbi9jb250cmFjdHMvdG9rZW4vRVJDNzIxL0VSQzcyMS5zb2wiOwoKY29udHJhY3QgRGVtb05GVCBpcyBFUkM3MjEgewogICAgdWludDI1NiBwdWJsaWMgbmV4dElkOwogICAgY29uc3RydWN0b3IoKSBFUkM3MjEoIkRlbW8gTkZUIiwgIkRORlQiKSB7fQogICAgZnVuY3Rpb24gbWludCgpIGV4dGVybmFsIHsgX3NhZmVNaW50KG1zZy5zZW5kZXIsIG5leHRJZCsrKTsgfQp9"
+  title="DemoNFT (ERC-721) · deploy to Sei testnet"
+  description="Remix IDE with an OpenZeppelin ERC-721 preloaded. Compile in-browser and deploy to Sei testnet."
+/>
+
 ## Setup
 
 <CodeGroup>
@@ -70,7 +90,7 @@

 </CodeGroup>

 ## Reading Token Data

 <CodeGroup>

@@ -96,7 +116,7 @@

 </CodeGroup>

 ## Checking Ownership Count

 <CodeGroup>

@@ -137,7 +157,7 @@

 </CodeGroup>

 ## Approving a Single Token

 <CodeGroup>

@@ -156,7 +176,7 @@

 </CodeGroup>

 ## Approving All Tokens (Operator)

 <CodeGroup>

@@ -188,7 +208,7 @@

 </CodeGroup>

 ## Watching Transfer Events

 <CodeGroup>

@@ -219,6 +239,6 @@

 </CodeGroup>

 ## CosmWasm NFT Compatibility

 CW721 tokens on Sei have ERC-721 pointer contracts that expose the standard ERC-721 interface. You can use all of the patterns above against a CW721 pointer address. See [Pointer Contracts](/evm/evm-parity/examples/pointer-contracts) for how to look up the pointer address.
diff --git a/evm/evm-parity/examples/error-handling.mdx b/evm/evm-parity/examples/error-handling.mdx
@@ -3,11 +3,33 @@
 description: 'Decode contract reverts, handle wallet rejections, and recover from RPC errors in Sei apps'
 ---
 
+import { RunSnippet } from '/snippets/run-snippet.jsx';
+
 # Error Handling
 
 Most transaction failures fall into three categories: contract reverts, wallet rejections, and RPC errors. This page shows how to decode each type and respond correctly.
 
+## Try it: see real errors
+
+The `RunSnippet` widget surfaces whatever the RPC returns — including failures. These two calls fail on purpose so you can see the exact error shape your code has to handle, live against Sei mainnet.
+
+<RunSnippet
+  method="eth_call"
+  params={[{ to: '0xcA11bde05977b3631167028862bE2a173976CA11', data: '0xdeadbeef' }, 'latest']}
+  network="mainnet"
+  title="A contract revert"
+  description="Calls an unknown selector (0xdeadbeef) on Multicall3. The node rejects it with execution reverted — the same class of failure as the Contract Reverts section below."
+/>
+
+<RunSnippet
+  method="eth_getBalance"
+  params={['0x123', 'latest']}
+  network="mainnet"
+  title="An RPC argument error"
+  description="A malformed address (0x123) triggers a JSON-RPC -32602 invalid argument error — distinct from a revert, and the kind of failure the RPC Errors and Retries section below handles."
+/>
+
 ## Contract Reverts
 
 When a transaction reverts, the error contains the revert reason if the contract provides one.

@@ -55,7 +77,7 @@

 </CodeGroup>

 ## Simulating Before Sending

 Always simulate write calls before submitting them. Simulation runs the call against current chain state and surfaces reverts before you spend gas:

@@ -70,7 +92,7 @@
 }
 ```

 ## Wallet Rejections

 Users can reject signature and transaction requests. These rejections have a predictable error code:

@@ -101,7 +123,7 @@

 </CodeGroup>

 ## Insufficient Funds

 <CodeGroup>

@@ -129,7 +151,7 @@

 </CodeGroup>

 ## Classifying Any Error

 A utility to handle the most common cases in one place:

@@ -156,7 +178,7 @@
 }
 ```

 ## RPC Errors and Retries

 Transient RPC failures (network timeouts, rate limits) can be retried. Don't retry on contract reverts or user rejections — those are deterministic.


diff --git a/evm/evm-parity/examples/ethers-quickstart.mdx b/evm/evm-parity/examples/ethers-quickstart.mdx
@@ -3,7 +3,10 @@
 description: 'Using ethers v6 with Sei in a Node.js script or browser context'
 ---
 
+import { RunSnippet } from '/snippets/run-snippet.jsx';
+import { SandboxEmbed } from '/snippets/sandbox-embed.jsx';
+
 # ethers v6 Quickstart
 
 This example covers ethers v6 with Sei. The patterns apply whether you are writing a Node.js script, a CLI tool, or a browser app.

@@ -19,7 +22,7 @@
 npx tsx script.ts
 ```

 ## Read-Only Provider

 ```ts
 import { ethers } from 'ethers';
@@ -27,7 +30,7 @@
 const provider = new ethers.JsonRpcProvider('https://evm-rpc.sei-apis.com');
 ```

 ## Reading Chain Data

 This is the first milestone — it needs no private key.

@@ -55,7 +58,32 @@
 
 The exact numbers are illustrative — your block number and balance will differ. `getBlockNumber()` and `getTransactionCount()` return a `number`, while `getBalance()` returns a `bigint` in wei (format it with `ethers.formatEther()`).
 
+## Try it live
+
+Run these read-only calls against Sei mainnet right now — no install, no private key. They're plain JSON-RPC, the same reads the script above performs.
+
+<RunSnippet method="eth_blockNumber" network="mainnet" title="eth_blockNumber" />
+
+<RunSnippet
+  method="eth_getBalance"
+  params={["0x0000000000000000000000000000000000000000", "latest"]}
+  network="mainnet"
+  title="eth_getBalance"
+  description="Balance in wei of the example address at the latest block — swap in any address."
+/>
+
+## Edit and run
+
+Edit and re-run the full ethers code from this page live in the browser — a real ethers v6 `JsonRpcProvider` reading Sei **testnet** (atlantic-2), so its block number and balances won't match the mainnet reads above:
+
+<SandboxEmbed
+  kind="codesandbox"
+  src="https://codesandbox.io/embed/qs82lw?view=split&hidenavigation=1&theme=dark"
+  title="ethers · read Sei testnet"
+  description="A real ethers v6 provider reading Sei testnet (atlantic-2). Edit index.js and the preview re-runs."
+/>
+
 ## Browser Provider
 
 In a browser context, connect to the user's injected wallet:

@@ -65,7 +93,7 @@
 const address = await signer.getAddress();
 ```

 ## Wallet from Private Key

 For scripts and backend services:

@@ -73,7 +101,7 @@
 const wallet = new ethers.Wallet('0xYourPrivateKey', provider);
 ```

 ## Sending a Transaction

 Next step — this requires a funded account; get testnet SEI from the [faucet](/learn/faucet).

@@ -87,7 +115,7 @@
 // receipt is final immediately — Sei has instant finality
 ```

 ## Reading a Contract

 ```ts
 const abi = ['function balanceOf(address owner) view returns (uint256)'];
@@ -96,7 +124,7 @@
 const balance = await contract.balanceOf('0xYourAddress');
 ```

 ## Writing to a Contract

 Pass a signer (wallet or browser signer) to the contract constructor for write operations:

@@ -107,7 +135,7 @@
 const receipt = await tx.wait();
 ```

 ## Estimating Gas

 ```ts
 const gas = await provider.estimateGas({
@@ -117,7 +145,7 @@
 });
 ```

 ## Listening for Events

 ```ts
 contract.on('Transfer', (from, to, value) => {
@@ -128,7 +156,7 @@
 contract.off('Transfer');
 ```

 ## Next Steps

 - [Python quickstart (web3.py)](/evm/python-quickstart) — the same first steps in Python
 - [ERC-20 interaction](/evm/evm-parity/examples/erc20) — full token read/write examples